What this means
The IEEE assigned the MA-L block EC84B4 to CIG SHANGHAI CO LTD. Every network interface they manufacture under this block has a MAC address beginning with these digits, followed by a unique per-device identifier. If a device on your network shows a MAC starting EC:84:B4, it is CIG SHANGHAI CO LTD hardware.
Frequently Asked Questions
Who owns MAC prefix EC84B4?
EC84B4 is registered to CIG SHANGHAI CO LTD in the IEEE MA-L registry.
What does the MA-L registry type mean?
An MA-L assignment, the IEEE's original OUI format, gives the vendor the first three octets and 16,777,216 device addresses under them. CIG SHANGHAI CO LTD's block covers 16,777,216 addresses.
What devices use EC84B4?
Any network device with a MAC address starting EC:84:B4 was manufactured by or for CIG SHANGHAI CO LTD.